In this study, horizontally periodic large eddy simulations (LES) are utilized to study turbulent atmospheric boundary-layer flow over wind turbines in the far-downstream portion of a large wind farm where the wakes have merged and the flow is fully developed. In an attempt to increase power generation by enhancing the mean kinetic energy (MKE) entrainment to the wind turbines, hypothetical syn...

A small-scale organic Rankine cycle (ORC) with kW-class power output has a wide application prospect in industrial low-grade energy utilization. Increasing the expansion pressure ratio of ORC is an effective approach to improve efficiency. However, there lack suitable expander for that can operate high efficiency under condition large and small mass flow rate. Aiming at design high-efficiency a...

Pelton turbine is the most commonly used high head impulse turbine with low discharge. For obtaining highest power output from runner one of the most important parameter is quality of jet which strikes bucket tangentially. The quality of jet and its impact work depends on the distance between the nozzle exit and runner along with its angle of strike. In the present paper, the effect of distance...

In this paper, the effects of shroud movement on transonic flow and heat transfer in vicinity turbine tip was studied by using 3-D simulation GE-E3 first-stage high pressure turbine. Aerothermal performance structure were analyzed with without moving, respectively. Based distribution limiting streamlines vortex structures, influential characteristics between leakage secondary generated studied....

Engine downsizing allows automotive manufactures to achieve improved efficiency and reduce emissions. Turbocharging can increase the power density of the engine, and therefore plays a vital role in downsizing. Due to the nature of the reciprocating engine, a turbocharger turbine operates in a highly unsteady environment. This paper presents a computational investigation looking at the impact of...

An axial steam turbine stage has both stationary and rotating components, which are coupled together in a CFD model by multiple frames of reference. There three types interface techniques available to exchange the information between different reference namely frozen rotor, stage, transient stator rotor. Both rotor interfaces used steady state analysis. The operation is inherently an unsteady p...